The movies are self contained and FCP is closed.
An interesting and frustrating note: I read somwhere that -47 might be a file name error. Cleaner does have a limit of 31 characters in an output file name, including the extension. Experimenting, in the Cleaner preferences, I turned off “append setting to file name.” I have a movie titled “ExponentialGrowth” way under 31 characters, but it still failed. I shortened it to “ExponGrowth” and it compressed. Yes it works, but with many movies to compress, it is not very scientific.
Thanks for trying…